Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ 4,908,619
Other comprehensive income (loss), net of tax	(125,115)	$ (138,618)	$ (124,003)
Balance at the end of the period	4,282,710	4,908,619
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	77,522	216,140
Other comprehensive income (loss) before reclassifications	(131,549)	(142,424)
Amounts reclassified from accumulated other comprehensive income (loss)	6,434	3,806
Other comprehensive income (loss), net of tax	(125,115)	(138,618)
Balance at the end of the period	(47,593)	77,522	216,140
Gains (losses) on cash flow hedges
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(2,044)	(2,419)
Amounts reclassified from accumulated other comprehensive income (loss)	374	375
Other comprehensive income (loss), net of tax	374	375
Balance at the end of the period	(1,670)	(2,044)	(2,419)
Unrealized gains (losses) on available-for-sale securities.
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	14,996	71,742
Other comprehensive income (loss) before reclassifications	(15,310)	(59,991)
Amounts reclassified from accumulated other comprehensive income (loss)		3,245
Other comprehensive income (loss), net of tax	(15,310)	(56,746)
Balance at the end of the period	(314)	14,996	71,742
Defined benefit pension plan items
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(7,263)	(4,075)
Other comprehensive income (loss) before reclassifications		(3,374)
Amounts reclassified from accumulated other comprehensive income (loss)	695	186
Other comprehensive income (loss), net of tax	695	(3,188)
Balance at the end of the period	(6,568)	(7,263)	(4,075)
Foreign currency items
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	71,833	150,892
Other comprehensive income (loss) before reclassifications	(116,239)	(79,059)
Amounts reclassified from accumulated other comprehensive income (loss)	5,365
Other comprehensive income (loss), net of tax	(110,874)	(79,059)
Balance at the end of the period	$ (39,041)	$ 71,833	$ 150,892